Steam-boiler.



2 SHEETS-SHEET 1.

No. 765,062. PATBNTED JULY 12, 1904. G. H. BARRUS.

STEAM BOILER.

APPLIQATION FILED 00T.1s, 1903. No MODEL.

N0 MODEL.

PATENTED JULY 12, 1904.

G. H. BARRUS. STEAM B0-ILBR.

PLIGATION FILBDOCT. 19, 1903.

2 SHEETS-SHEET 2;

WITNESSES INVENTOR UNITED STATES Patented July 12, 1904.

PATENT OFFICE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No, 765,062, dated July 12,1904.

Application led October 19, 1908. Serial No. 177,577. (No model.)

T0 all whom, it nca/y concern:

Be it known that l, GEORGE H. BARRUs, of Brookline, Norfolk county,Massachusetts, have invented a new and useful Steam-Boiler, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specification, inwhich- Figure 1 shows in vertical section a steamboiler constructed inaccordance with my invention. Fig. 2 is a rear elevation, theboilersetting being shown in vertical section on the line II H ofFig. 1. Fig. 3 is a transverse section of the settling-drum, showing thedevices by which it is braced. Eig. 4 is an elevation of the crown-barsor braces of the settling-drum, and Fig. 5 is an axial section of thesettling-drum.

The object of my invention is to improve the construction ofsteam-boilers, and to provide means to prevent the deposits in thetubes, which have heretofore constituted an objection to the use of theclass of water-tube boilers having rectangular banks of inclined andrelatively staggered tubes connected by headers to an upper longitudinaldrum or drums.

The invention is illustrated in the accompanying drawings, in which- 2 2are the upper longitudinal steam and water drums. I show two of thesedrums in the drawings; but one or more may be em? ployed, if desired.

3 4 are the banks of water-tubes, the tubes being inclined somewhat tothe horizontal and being relatively staggered in position. The upperbank of tubes 3 has at its ends connecting headers 5 6, provided withcovered hand-holes 7 opposite the respective tubes. rlhe headers at thefront end of the bank are connected to the drum 2 by nipples 8, and theheaders of the two banks are connected together by nipples 9. The tubesof the lower bank 4 are expanded into a settling-chamber or muddrum 10,which extends transversely of the boiler and is of general cylindricalform, iiattened, however, on Vthe front side so as to present a fiatsurface for the attachment of the tubes. To strengthen the drum againstthe weakness which would result from the fiattening of the side, Iprovide it on its interior with bracing crown-bars 11, which are rivetedto the flat side and are formed with holes c, which are in line with theends of the tubes and are of equal or preferably somewhat largerdiameter than the tubes, so as to present no obstruction to the freepassage of water through and from the drum and allow the introduction ofa tube-expander. The drum 10 is connected to the headers at the rear ofthe upper bank of tubes by a series of pipes or nipples 12 and isconnected with the rear end of the upper drums 2 by pipes 13, attachedto the drum 10 at vplaces opposite to the flat side and of suitablediameter to accommodate the entire circulation of water from the upperdrums. The drum 10 is thereby so located and connected as to provide forthe free passage of the entire water circulation before the water entersthe tubes of the boiler, and it is of sufficiently large diameter toretard greatly the velocity of the water in the drum, so as to causewithin it such quiescence of the water as will insure the precipitationof the impurities. For this purpose a drum nine feet in length andthirtysix inches in diameter for a two-hundred-andiifty-horse-powerboiler will suffice. It must not be materially smaller than this and maybe made of greater capacity.

The upper drums have feed-water pipes 14, and the boiler is -inclosed ina setting comprising front and end walls and side walls 15, baiiie-walls16, and a stack-flue 17..

In the operation of the boiler feed-water is admitted to the upper drumsfrom the feedpipe 14, and thence circulating in the direction of thearrows in Fig. 1 all of it passes down through the pipes 13 into thesettlingdrum 10. The water has been heated to its full temperature ofevaporation by the time it reaches this drum, and as its velocity isgreatly retarded in the 'drum the solid matter is deposited in thelatter, and the purified water thence flows into the lower bank of tubes4 and through the headers 6 into the upper bank of tubes 3. The waterthence passes forward through these banks of tubes and through theheaders at the front ends into By the use of the steam and water drums.

IOO

the settling-chamber l am thus enabled toremove the solid matter fromthe boiler before it reaches the tubes of the boiler. I thuspreservethese tubes from serious incrustation, render unnecessary the frequentcleaning of the tubes, and greatly enhance the eiliciency and durabilityof the apparatus.

I claim- 1. A water-tube boiler having a plurality of banks oi' parallelinclined and relatively staggered tubes, one 0r more cylindrical steamand water drums above the tubes, headers connecting the tubes at thefront ends and themselves connected with the steam and water drums, atransverse substantially cylindrical settling-drum below the steam andwater drums and at the lower ends of the tubes, said settling-drumhaving a flattened side with braces applied thereto and connected atsaid side with the lower bank of tubes, and headers at the rear end ofthe other bank or banks of tubes connecting said tubes and themselvesconnected with the settling-drum, said settling-drum constituting thesole water conncction between the steam and water drums and the rearportion of the bank of tubes, whereby the whole body of water incirculation including the feed-water passes through the settling chamberbefore reaching the tubes, and said settling-drum being of suflicientcapacity to retard greatly the Velocity oi' the water passingtherethrough, and to precipitate the impurities contained in the water;substantially as described.

2. A water-tube boiler having a substantially cylindrical settling-drum,one side of which is flattened to serve as a tube-head, and bracingcrown-bars riveted to the interior of the flattened side of the drum andhaving perforations in line with the tube-openings thereof and o1u equalor greater diameter; substantially as described.

` 1n testimony whereof I have hereunto set my hand.

GEORGE H. BARRUS. Witnesses:

LYDIA A. BRIMMER, J osnrn J. LEONARD.

